Absorption testing device of a vacuum cleaner



FIG. 1 is a perspective view of an absorption testing device of a vacuum cleaner, showing new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for an absorption testing device of a vacuum cleaner, as shown and described. 